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Biology of the Mountain Crayfish Euastacus Sulcatus Riek, 1951 (Crustacea: Parastacidae), in New South Wales, Australia

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Biology of the Mountain Crayfish Euastacus Sulcatus Riek, 1951 (Crustacea: Parastacidae), in New South Wales, Australia Journal of Threatened Taxa | www.threatenedtaxa.org | 26 October 2013 | 5(14): 4840–4853 Article Biology of the Mountain Crayfish Euastacus sulcatus Riek, 1951 (Crustacea: Parastacidae), in New South Wales, Australia Jason Coughran ISSN Online 0974–7907 Print 0974–7893 jagabar Environmental, PO Box 634, Duncraig, Western Australia, 6023, Australia [email protected] OPEN ACCESS Abstract: The biology and distribution of the threatened Mountain Crayfish Euastacus sulcatus, was examined through widespread sampling and a long-term mark and recapture program in New South Wales. Crayfish surveys were undertaken at 245 regional sites between 2001 and 2005, and the species was recorded at 27 sites in the Clarence, Richmond and Tweed River drainages of New South Wales, including the only three historic sites of record in the state, Brindle Creek, Mount Warning and Richmond Range. The species was restricted to highland, forested sites (220–890 m above sea level), primarily in national park and state forest reserves. Adult crayfish disappear from the observable population during the cooler months, re-emerging in October when the reproductive season commences. Females mature at approximately 50mm OCL, and all mature females engage in breeding during a mass spawning season in spring, carrying 45–600 eggs. Eggs take six to seven weeks to develop, and the hatched juveniles remain within the clutch for a further 2.5 weeks. This reproductive cycle is relatively short, and represents a more protracted and later breeding season than has been inferred for the species in Queensland. A combination of infrequent moulting and small moult increments indicated an exceptionally slow growth rate; large animals could feasibly be 40–50 years old. Implications for the conservation and management of E. sulcatus are discussed. Keywords: Conservation, Euastacus, IUCN, growth, moulting, reproduction, spiny crayfish, subtropical rainforest, threatened species. Abbreviations:AbGR - absolute growth rate; AbW - abdominal width; NP - National Park; NSW - New South Wales; OCL - orbital carapace length (see Morgan 1997); PCMI - percent moult increment; PropL - propodal length; SF - State Forest DOI: http://dx.doi.org/10.11609/JoTT.o3647.4840-53 | ZooBank: urn:lsid:zoobank.org:pub:A250C1DA-124E-4742-B1D8-697DABEE542D Editor: Tadashi Kawai, Wakkanai Fisheries Research Institute, Hokkaido, Japan. Date of publication: 26 October 2013 (online & print) Manuscript details: Ms # o3647 | Received 01 June 2013 | Final received 02 October 2013 | Finally accepted 05 October 2013 Citation: Coughran, J. (2013). Biology of the Mountain CrayfishEuastacus sulcatus Riek, 1951 (Crustacea: Parastacidae), in New South Wales, Australia. Journal of Threatened Taxa 5(14): 4840–4853; http://dx.doi.org/10.11609/JoTT.o3647.4840-53 Copyright: © Coughran 2013. Creative Commons Attribution 3.0 Unported License. JoTT allows unrestricted use of this article in any medium, reproduction and distribution by providing adequate credit to the authors and the source of publication. Funding: Funding was provided by Southern Cross University, the Australian Geographic Society, and jagabar Environmental. Competing Interest:Author declare no competing interests. Author Details: Jason Coughran completed a PhD in Biology at Southern Cross University in 2006, and his research interests are the biology, ecology, taxonomy and conservation of aquatic fauna, with a focus on inland systems. He is currently engaged in these fields through a private research and consulting entity, jagabar Environmental. Acknowledgements: This work was undertaken during my postgraduate research at Southern Cross University, and I thank my supervisor Don Gartside and the technical staff who assisted me: Craig Taylor, Max Egan, Maxine Dawes, Peter Bligh-Jones and Roz Hagan. Research funds were provided by Southern Cross Uni- versity and the Australian Geographic Society. Amy Coughran, Andy Moore, Ben Black, David Newell, Paul Collins, Shawn Leckie and Stephen Waddington assisted with field work for this species, and the National Parks and Wildlife Service, NSW Fisheries and State Forests of NSW departments provided scientific collection permission. I thank Jagabar Environmental for providing me with time to prepare the manuscript, and two anonymous reviewers for their constructive comments. 4840 Biology of Euastacus sulcatus Coughran INTRODUCTION Queensland (Furse & Wild 2002a,b, 2004; Furse et al. 2004, 2006), its NSW distribution is unclear. Further, Edgar Riek (1951) formally described the Mountain many biological aspects remain undocumented Crayfish, Euastacus sulcatus, from over one hundred including: (i) the incidence of wounds and disease; (ii) specimens collected from Tamborine Mountain reproductive biology details; and (iii) wild moulting and and Lamington National Park (NP) in southeastern growth increments. In this paper, I present the findings Queensland, Australia. In the same paper, Riek also of a detailed biological research program encompassing described E. cunninghami from Cunningham’s Gap. both broad field surveys in NSW, and a two-year mark These taxa were distinguished largely on the basis that and recapture program examining the biology of E. E. cunninghami was more setose and had reduced sulcatus. abdominal spination. However, it subsequently became apparent that these two species were conspecific, and the latter was synonymised with E. sulcatus by Morgan METHODS (1988). The collections by Morgan (1988) also provided Field surveys were undertaken at 245 sites across a more complete understanding of the distribution northeastern NSW between 2001 and 2005, with the for E. sulcatus, extending in an arc from Tambourine aim of thoroughly describing the taxonomy, distribution, Mountain to the Lamington Plateau, westwards along habitat and ecology of all regional crayfish species the McPherson Range bordering New South Wales (Coughran 2006a). Sampling was undertaken via NSW (NSW), and north again to the Mistake Mountains. He Scientific Collection permits, and the NSW National recorded the species from only two NSW sites, at Brindle Parks and Wildlife Service’s (2001) Frog Hygiene Protocol Creek and Mount Warning (Morgan 1988). The species was followed throughout the study. Crayfish were was subsequently recorded further west in NSW, on collected by hand or hand net, with baited string lines the Richmond Range (Leckie 1999; Coughran 2000), or traps (with meat baits), or by lifting rocks and other prompting a comprehensive research program on its debris and probing burrows by hand. Both diurnal and distribution, taxonomy, biology and ecology (Coughran nocturnal surveys were undertaken, and observations 2006a). were made of crayfish activity, conspecific interactions Euastacus sulcatus is a large, spiny crayfish species, and the presence of wounds and disease. Habitat reaching up to 340mm in overall length, and 425g in characteristics and basic water quality parameters (pH, weight (Furse & Wild 2004). The species differs from conductivity, dissolved oxygen and temperature) were most other large, spiny species of Euastacus, including recorded throughout the study. E. suttoni and E. valentulus in the immediate region, in that it lacks thoracic spines. It is also regionally unique Population Study: Brindle Creek (Images 1 & 2) because it exhibits marked base colour variation: for In addition to data collected from surveys across the example, specimens from the Lamington Plateau and species’ NSW range, a long-term monitoring site was Springbrook in Queensland are blue, while specimens established at Brindle Creek, in the World Heritage listed from Brindle Creek and the Richmond Range in NSW Border Ranges NP (Fig. 1). The site comprised typical are typically red (Morgan 1988; Coughran 2000, Brindle Creek habitat, the predominant locality of three 2006a,b). In addition to its striking colouration, large historic sites of record for the species in NSW, and size and impressive spination, E. sulcatus has become sufficiently far away (and upstream) from the popular an iconic species for park visitors, due to its tendency to recreational part of the park to avoid visitor impacts. periodically wander around on forest floors (Riek 1951; The site encompassed a stream length of approximately Morgan 1991; Furse & Wild 2002b; Furse et al. 2004). 500m. Despite the above, several knowledge gaps remain The creek at this site was relatively large, reaching for this species, which has recently been formally widths of 5–10 m, and with pools often 1–2 m deep. recognised as Endangered on the IUCN Red List of There was a permanent flow in the creek, and all Threatened Species (Furse & Coughran 2010). Filling sections retained some surface water throughout the these knowledge gaps is of fundamental importance to sampling period. The substratum was generally fine, but ensuring the conservation of this species. For example, also incorporated a coarser component of gravelly sand although the ecology and population characteristics in places. There was moderate to dense cobble and of E. sulcatus have been relatively well studied in boulder cover in most of the larger pools, in which rocks Journal of Threatened Taxa | www.threatenedtaxa.org | 26 October 2013 | 5(14): 4840–4853 4841 Biology of Euastacus sulcatus Coughran Figure 1. The NSW distribution of the Mountain Crayfish,Euastacus sulcatus, was greatly extended during the study (new sites indicated with stars), and the species was also recorded at all previously known sites (circles). Distinct
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